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Question: The administration of a large university wants to take a random sample to measure student opinion of a new food service on campus. It plans to use a continuous scale from 1 to 100, on which 1 is complete dissatisfaction and 100 is complete satisfaction. The administration knows from past experience with such questions that the standard deviation for the responses is going to be about 5, but it does not know what to expect for the mean. It wants to be almost sure that the sample mean is within plus or minus 1 point of the true population mean value. How large will the random sample have to be?
People in a large population average 60 inches tall. You will take a random sample and will be given a dollar for each person in your sample who is over 65 inches tall. Does the law of average relate to the answer you give?
A hospital human resources manager finds that the local average starting salary for nurses is $24,000. She randomly samples 10 nurse's salaries at the hospital and calculates a mean of $23,450 and a standard deviation of $400.
Are the sample means for n = 5 and n = 10 "close" to the theoretical mean, µx? Explain why or why not. Which of the two distributions of sample means.
Using Chi-square table finding the P-value and interpret the result
you are in charge of resucing the water consumption in a dormitory at a university and thus have been charged with
Public health statistics indicate that about 26.4% of Americans smoke. Suppose a random sample of 50 people is selected. Approximate the distribution of the same proportion with the normal model.
Obvious tests In many cases, hypothesis testing is used when the evidence is obvious. For example, why would you even bother testing if the true mean is 50 ppm?
Draw a negatively skewed distribution.- What does it indicate if a participant has a z-score of 2.5? -.80? .OO?
in a survey of 100 business executives 60 per cent were male and 40 per cent were female. 70 per cent of the male
Hippocrates magazine states that 35 percent of all Americans take multiple vitamins regularly. Suppose a researcher surveyed 750 people to test this claim and found that 297 did regularly take a multiple vitamin. Is this sufficient evidence to con..
Using the Pearson correlation coefficient, researchers studying the dangers of cell phone use while driving found a positive correlation.
Find the critical value to test the claim that all ages have crash rates proportional to their driving rates. That all ages have crash rates proportional to their driving rates.
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